Branches

ekavimsatibhedena rgvedam krtavan pura
sakhanantu satenaiva yajurvedamathakarot
samavedam sahasrena sakhanam pravibheda sah
atharvanamatho vedam vibheda navakena tu

"The Rgveda was divided into 21 branches and the Yajurveda into 100 branches, the Samaveda into 1,000 branches and the Atharvaveda into 9 branches." (Kurma Purana 52.19-20)

Further, every branch has four subdivisions called Samhita (or Mantra), Brahmana (contains mantras and prayers), Aranyaka and Upanisad (both with philosophical contents). So all in all, the Vedas consist of 1130 Samhitas, 1130 Brahmanas, 1130 Aranyakas, and 1130 Upanisads, a total of 4520 titles.

According to Jiva Gosvami's Tattva-sandarbha only about 11 Samhitas, 18 Brahmanas, 7 Aranyakas, and 220 Upanisads are available. This is less than 6% of the original Vedas as Rest are hidden to be accessed at spiritual Platform.

https://www.google.com/search?q=ekavimsati+bhadana+rigveda+krtavan+pura